Half to james jacob hoblitzell



(No Model.) l

A. HAHN.

MOLD FOR MAKING TUBULAR BRI`CKS. v No. 255,972. i l Patented Apr. 4,1882e 5f f m .nmlllllmllllmm w A. ',l '1| Iy l MJVIESEES- LLVEVUR' o5. 6.615%@ wm m ad @Mm Q w d@ IINrraoSrarr-as `Param FFICE ADAM HAHN, OF KEYS/[ONE JUNCTION, PENNSYLVANIA, ASSIGNOR OF ONE l HALF TO JAMES JACOB HOBLITZELL, OFBAMFJ PLACE.

MOLD FOR MAKING TUBULAR BRICKS.

SPECIFICATION forming part of Letters Patent No. 255,972, dated April 4,1882.

Application tiled December 5, 1881.

To all whom fit may concern Be it known that 1, ADAM HAHN, of Keystone Junction, in the county ot' Somerset and State of Pennsylvania, have invented a new and useful Improvementin Molds for Making Tubular Bricks; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention consists in an improved mold for making tubular bricks for blast-stoves and hot-air conduits generally.

The diiculty heretofore experienced with such molds has been that, the core being solid and with a blunt upper end, the plastic material caught thereon and Was difficult to get down into the cavity of the mold, and this made the operation very slow. Another difticulty was that the bricks, when formed, stuck in the mold and could not be easily removed. zo By my improvement these difficulties are both obviated, the material can be "slapped down into the mold in the usual Way practiced in making bricks by hand, llling the mold perfectly, and when the brick is formed it can be instantly emptied therefrom by simply inverting the mold on the table or carrying-board.

To enable others skilledI in the art to make and use my improved mold, l will now describe it by reference to the accompanying drawings, in which- Figure 1 is a plan vieiv of my improved mold. Fig. 2 is a longitudinal section ofthe same on the linear Fig. 3 1s an end view; and Fig. 4: is a perspective view of the brick and movable parts ot' the mold, and illustrates the manner of removing the brick from the mold.

Like letters of reference indicate like parts.

The mold a is preferably a wooden box of rectangular form. Ithas a hollow central core, 4o b, having a sharp upper edge, c, and acavity, d, which opens clear through, as at d', for the escape of the air therefrom when the plastic material descends in it. The sides of the corea are perforated, as at c, to prevent the material sticking` toit when the brick is turned out. The central core, b, does not extend above theupper' face of the mold, in order that it may not interfere with cutting off the surplus material, and that it may not strike the table or carrying-board when the brick is turned out.

(No model.)

In the ends ot' the mold are sliding or removable piecesf. which tit in recesses or doveta'ilsg, and are reta-inedin place thereby. These piecesf constitute the end molding-laces, and preferably the greater part of the sui-ffice that formstheexteriorotthe brick. In theinstance shown-. e.,'a hexagonal brick-they lorm four of the six lsides The external surface of the core b is slightly tapered, as also are the outer sides ot' the pieces f, to give sufficient 6o draft to permit'the'easy discharge of the brick. This is shown in the section, Fig. 2, the draft of the piecesj' being on the lilies /L h. The instance shown is a hexagonal brick for usevin the construction of the hot-air dues ot` a SiemensOowperOochrane hot-blast stove. The mold is six inches deep and the draft is tiveeighths ot an inch. In this case the central opening, i', is round and the external shape is hexagon. I do not, however, limit myself to 7o that or any other shape of tubular brick, as I can make bricks having a central opening of polygonal, oval, or other shape and au external form of round, oval, square, or any polygonal shape.

The bottom ofthe mold-cavity should be vented to permit the escape of air when the material is cast therein.

Iii use, when making bricks by hand, the material is slapped in and the surplus is cut 8o oft by a string, all in the usual way. The mold is then inverted on the table, or carrying-board, and the brick, with the adhering end pieces,f, drops out, and then the end pieces are drawn oit' ofthe brick, all as shown in Fig. 4. I am 85 enabled to effect the easy removal of the brick by reason ofthe dropping out ofthe end pieces,

f, to which it adheres. It parts freely from the fixed sides 7a and the central core, b. rlhe sharp edge c of the core cuts the clay as it 9o goes into the mold, and thereby enables it to pass down into the mold-cavity, instead of, as heretofore, being stopped by the blunt upper end of the core. l

This mold may be used in the manufacture of pressed bricks.

vThe bricks are designed for use in the construction of conduits, especially for the conduction of hot air and similar gases.

It' desired,the mold may have more than one 10o hollow core, and also all the molding sides rei 2. A mold for forming tubular bricks, having movable; also, theinovable side or end pieces,

a hollow eore or cores provided with an upper cutting-edge, and removable side or end pieces, 15 substantially asztndforthe purpose described.

In testimony whereof I have hereunto set f, may be retained in their places by ineens of the pins Z, extending into the slots m, Figs. 2 and 3, which permit zt limited discharging movement of the movable pieces. my hand.

What I claim as my invention and desire to secure by Letters Patent, is 7 ADAM HAHN l. A mold for forming tubular bricks, having Witnesses:

a, hollow Core or cores provided with an upper cutting-edge, substantially as and for the purposes described.

A. E. FrNEG-AN, H. CLAY MCKINLEY. 

